To most Americans, the names are unfamiliar, maybe a little hard to pronounce: Huawei, Xiaomi, Oppo, Vivo.
They are China’s biggest smartphone brands. Around the world — although not in the United States — they are making the handset business brutally competitive. This week, after Apple warned of disappointing iPhone sales in China, industry observers said that devices from the Chinese brands were a major culprit.
As the phone market in China reaches saturation and sales shrink over all, the country’s hardware makers are pushing hard, and increasingly winning fans, in places like France, Germany, India and Southeast Asia, where consumers

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